TDA7460ND STMicroelectronics, TDA7460ND Datasheet
TDA7460ND
Specifications of TDA7460ND
Available stocks
Related parts for TDA7460ND
TDA7460ND Summary of contents
Page 1
... C bus ■ Low distortion ■ Low noise Description The TDA7460ND is a high performance signal processor specifically designed for car radio applications. The device includes a complete audio processor and a stereo decoder with noise blanker, stereo blend and all signal processing functions necessary for state-of-the-art as well as future car radio systems ...
Page 2
... Stereo decoder part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2/49 Input multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Bass control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Treble control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Speaker control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Mute functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 How to find the right input configuration . . . . . . . . . . . . . . . . . . . . . . . . 15 Input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 AutoZero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Soft mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Soft step volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 DC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Speaker attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 TDA7460ND ...
Page 3
... TDA7460ND 5.1 Stereo decoder feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.2 Stereo decoder electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.3 Noise blanker part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.4 Multipath detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.5 Description of stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.5.1 5.5.2 5.5.3 5.5.4 5.5.5 5.5.6 5.5.7 5.5.8 5.5.9 5.6 Functional description of the noise blanker . . . . . . . . . . . . . . . . . . . . . . . 30 5.6.1 5.6.2 5.6.3 5.6.4 5.7 Functional description of the multipath detector ...
Page 4
... Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Table 17. Bass and treble attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Table 18. Bass and treble filter characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Table 19. Speaker attenuation (LF, LR, RF, RR Table 20. Stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Table 21. Noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Table 22. Field strength control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Table 23. Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Table 24. Stereo decoder adjustment Table 25. Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Table 26. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 4/49 TDA7460ND ...
Page 5
... TDA7460ND List of figures Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2. Pin connection (top view Figure 3. Input configuration tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 4. Input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Figure 5. Loudness attenuation @ fc = 400 Hz (second order Figure 6. Loudness center frequency @ Attn (second order Figure 7. Loudness @ attn dB 400 Figure 8. Soft mute timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 9. Soft step timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 10 ...
Page 6
... DIGITAL CONTROL DEMODULATOR PILOT + STEREO ADJUST 25KHz + STEREO BLEND LP PIL MULTIPATH- NOISE DET DETECTOR BLANKER 11 OUT LR OUT LF TREBLE BASS OUT RR OUT BUS HIGH S & H CUT CONTROL D PULSE A FORMER 10 LEVEL TDA7460ND 17 OUT LR 19 OUT LF 16 OUT RR 18 OUT RF 12 SCL 13 SDA D97AU629A ...
Page 7
... TDA7460ND 2 Pin description Figure 2. Pin connection (top view) Table 2. Pin description N. Name 1 CASSR Cassette input right 2 CASSL 3 CDR 4 CDGND Ground reference CD 5 CDL 6 PHGND Phone ground (MPOUT selectable PHONE Phone input (MPIN selectable MPX 10 LEVEL 11 SMUTE Soft mute drive 12 SCL 13 SDA ...
Page 8
... Phone differential or single ended input ● Internal beep with 2 frequencies (selectable) ● Mixable phone and beep signals 8/49 Parameter Test condition Audioprocessor (all filters flat) Stereo decoder + Audioprocessor Parameter TDA7460ND Value Unit 10 °C -55 to 150 °C Min. Typ. Max. Unit 7.5 ...
Page 9
... TDA7460ND 3.5.2 Loudness ● First or second order frequency response ● Programmable center frequency and quality factor ● steps ● Selectable flat-mode (constant attenuation) 3.5.3 Volume control ● attenuator ● Max. gain 20 dB ● Max. attenuation 79 dB ● Soft-step gain control 3.5.4 ...
Page 10
... All inputs except phone Adjacent gain step MIN MAX Differential Common mode kHz CM RMS kHz CM RMS KHz flat; all stages 0 dB Differential Common mode kHz CM RMS kHz CM RMS Source Source Source Beep/Phone TDA7460ND Min. Typ. Max. Unit 70 100 130 kΩ 2.2 2.6 V RMS 80 100 ...
Page 11
... TDA7460ND Table 6. Audio processor electrical characteristics (continued ° amb Symbol Parameter A Max attenuation MAX A Step resolution STEP E Attenuation set error A E Tracking error steps DC Loudness control A Step resolution STEP A Max. attenuation MAX f Lower center frequency CMIN f Higher center frequency CMAX Soft mute ...
Page 12
... L R Output impedance OUT V DC voltage level DC 12/ kΩ; all gains = 0 dB KHz; unless otherwise specified) L Test condition off Adjacent attenuation steps d = 0.3% TDA7460ND Min. Typ. Max. Unit 0.9 1 1.1 1.1 1.25 1.4 1.3 1.5 1.7 1 ±13 ±14 ± ...
Page 13
... TDA7460ND Table 6. Audio processor electrical characteristics (continued ° amb Symbol Parameter General e Output noise NO S/N Signal to noise ratio d Distortion S Channel separation left/right C E Total tracking error T 1. The SM pin is active low (mute = 0) 2. See Section 3.5.4: Bass control and Section 3.5.5: Treble control. ...
Page 14
... Description of the audio processor part 4 Description of the audio processor part 4.1 Programmable input matrix The programmable input matrix of the TDA7460ND offers several possibilities to adapt the audioprocessor to the desired application the standard application we have: CD quasi differential ● Cassette stereo ● Phone differential ● ...
Page 15
... Here you will find the special pinout as well as the special programming codes for selecting sources. For example in Appl. 6 the TDA7460ND has to be configured while startup with the databyte 0/xxxx0xxx. To select the FM phone source the last five significant bits of subaddress 0 have to ...
Page 16
... The additional buffer of the CD input avoids this drawback and offers the full common-mode rejection even with those CD players. The TDA7460ND can be configured with an additional input; if the AC coupling before the speaker stage is not used (bit 7 in subaddress 5 set to "1") ACINL and ACINR pins can be used as an additional stereo input ...
Page 17
... TDA7460ND 4.2.1 Loudness There are four parameters programmable in the loudness stage (see and Figure 7.): ● Attenuation ● Center Frequency ● Loudness Q Flat Mode: in this mode the loudness stage works attenuator. Figure 5. Loudness attenuation @ fc = 400 Hz (second order) Figure 6. Loudness center frequency @ Attn (second order) Figure 7 ...
Page 18
... For steps more than 1 dB the soft step mode should be deactivated because it could generate error during the blend-time 18/49 8.). 2 C bus output register is set to 1 from the start of 1 EXT. MUTE +SIGNAL REF -SIGNAL BUS OUT D97AU634 VOUT 2dB 1dB 10ms -1dB -2dB TDA7460ND 2 C bus Time Figure 9.). Time D97AU635 ...
Page 19
... TDA7460ND 4.2.4 Bass There are three parameters programmable in the bass stage (see Figure 12., Figure ● Attenuation ● Center Frequency (60, 70, 80 and 100 Hz) ● Quality Factors (1, 1.25, 1.5 and 2) 4.2.5 DC mode In this mode the DC gain is increased by 4.4 dB. In addition the programmed center frequency and quality factor is decreased by 25% which can be used to reach alternative center frequencies or quality factors ...
Page 20
... Figure 13. Bass normal and DC mode @ Gain 15.0 12.5 10.0 7.5 5.0 2.5 0.0 10.0 1.0K 10.0K Figure 15. Treble center freq. @ gain = 14 dB 15.0 12.5 10.0 7.5 5.0 2.5 0.0 1.0K 10.0K 10.0 TDA7460ND 100.0 1.0K 10. 100.0 1.0K 10.0K 100.0 1.0K 10.0K ...
Page 21
... TDA7460ND 5 Stereo decoder part 5.1 Stereo decoder feature ● No external components necessary ● PLL with adjustment free fully integrated VCO ● Automatic pilot dependent mono/stereo switching ● Very high suppression of intermodulation and interference ● Programmable Roll-Off compensation ● Dedicated RDS soft mute ● ...
Page 22
... Test condition Bit = 7, Subadr 0VLEVEL >> VHCH Bit = 7, Subadr 1VLEVEL >> VHCH Bit = 7, Subadr 0VLEVEL >> VHCL Bit = 7, Subadr 1VLEVEL >> VHCL kHz kHz kHz kHz TDA7460ND Min. Typ. Max. Unit 100 ms 100 150 200 ...
Page 23
... TDA7460ND Table 8. Stereo decoder electrical characteristics (continued de-emphasis time constant = 50 μ kHz dB Symbol Parameter (2) Intermodulation α2 Pilot signal α3 (3) Traffic radio α57 Signal SCA - Subsidiary communications authorization α67 Signal ACI - Adjacent channel interference α114 Signal α190 Signal 1. By design/characterization but functionally guaranteed through dedicated test mode structure. ...
Page 24
... NCT = 10 180 NCT = 11 140 0.5 0.9 1.5 1.7 2.2 2.5 OVD = 11 0.5 0.9(off) OVD = 10 0.9 1.2 OVD = 01 1.7 2.0 OVD = 00 2.5 2.8 FSC = 11 0.5 0.9(off) FSC = 10 1.0 1.3 FSC = 01 1.5 1.8 FSC = 00 2.0 2.3 TDA7460ND Unit 1.3 V 2.1 V 2 1.5 ...
Page 25
... TDA7460ND Figure 16. Noise blanker diagram Figure 17. Trigger threshold vs. V Figure 18. Deviation controlled trigger adjustment Figure 19. Fieldstrength controlled trigger adjustment HIGH D97AU636 PEAK VTH MIN. TRIG. THRESHOLD 65mV 8 STEPS 30mV 0.9V D97AU648 V PEAK ( 2.8 2.0 1.2 0.9 20 32.5 45 D97AU649 V PEAK MONO »3V ...
Page 26
... configuration byte = DEMODULATOR INFILTER - PLOT CANC - ROLL-OFF COMP. LP 80KHz - LP 25KHz 4.th ORDER PLL + PILOT-DET. SB CONTROL F19 F38 STEREO NOISE BLANKER - HOLDN D97AU762 TDA7460ND Min. Typ. Max. Unit 19 KHz 7.6 4 1.5 mA DEEMPHASIS FM_L + HIGHCUT t=50 or 75μs FM_R HC CONTROL REF 5V ...
Page 27
... Stereo decoder mute The TDA7460ND has a fast and easy to control RDS mute function which is a combination of the audioprocessor soft mute and the high-ohmic mute of the stereo decoder. If the stereo decoder is selected and a soft mute command is sent (or activated through the SM pin) the stereo decoder will be set automatically to the high-ohmic mute condition after the audio signal has been softmuted ...
Page 28
... TDA7460ND offers an I compensate the lowpass behavior of the tuner section. If the tuner attenuation at 38kHz range from 20.2% to 31% the TDA7460ND needs no external network before the MPX pin. Within this range an adjustment to obtain at least 40d B channel separation is possible. The bits for this adjustment are located together with the fieldstrength adjustment in one byte ...
Page 29
... The included detector enables the demodulation if the pilot tone reaches the selected pilottone threshold VPTHST. Two different thresholds are available. The detector output (signal STEREO, see reading the status byte of the TDA7460ND via I 5.5.6 Fieldstrength control The fieldstrength input is used to control the high cut and the stereo blend function. In addition the signal can be also used to control the noise blanker thresholds ...
Page 30
... Therefore they have a temperature coefficient near zero. This is useful if the fieldstrength signal is also temperature compensated. But most if devices apply a level voltage with 3300 ppm. The TDA7460ND offers this TC for the reference voltages, too. The TC is selectable with bit D7 of the "stereo decoder adjustment" ...
Page 31
... TDA7460ND 5.6.1 Trigger path The incoming MPX signal is highpass filtered, amplified and rectified. This second order highpass-filter has a corner frequency of 140kHz. The rectified signal, RECT, is lowpass filtered to generate a signal called PEAK. Also noise with a frequency 140 kHz increases the PEAK voltage. The PEAK voltage is fed to a threshold generator, which adds to the PEAK voltage a DC dependent threshold VTH ...
Page 32
... The internal signals available are shown in the software specification. Figure 27. Block diagram of the multipath detector LEVEL MPIN 32/49 VDD DC=1μ MP ENABLE RECTIFIER BANDPASS 19KHz 15K GAIN GAIN 2 BITS 2 BITS D98AU862 TDA7460ND int. INFLUENCE TO PHONE_GND - APR MPOUT 220nF ...
Page 33
... TDA7460ND Figure 28. Application example 1 (with phone input CASS R CASS L CDR CDG CDL PHGND PHONE Figure 29. Application example 2 (with multipath) = CASS R CASS L CDR CDG CDL UNWEIGHTED LEVEL 100nF 100nF CASS R 100nF CASS L TDA7460 100nF CDR 22μF CDG 100nF CDL 220nF PHONE_GND 220nF ...
Page 34
... AZ = AutoZero-Remain Testing Auto increment Stop; Max clock speed is 500 kbits/s. The transmitted data is automatically updated after each ACK. Transmission can be repeated without new chip address. 34/49 SUBADDRESS LSB MSB R/W ACK TDA7460ND DATA 1 to DATA n LSB MSB LSB ACK DATA ACK P ...
Page 35
... TDA7460ND 6.2 Auto increment If bit I in the subaddress byte is set to "1", the auto increment of the subaddress is enabled. Table 11. Transmitted data (send mode) MSB Soft Mute activated Stereo not used Table 12. Subaddress (receive mode) MSB Testmode I = Auto increment AZ = Auto Zero Remain X = not used ...
Page 36
... For example to select the CD input in quasi-differential mode with gain of 8dB the data byte is: 0/01111000 36/ TDA7460ND LSB Function D0 Source selector Cassette 0 Phone Stereo decoder 1 Input FM 0 Mute 1 AC inputs CD mode CD full-differential CD quasi-diff AM/FM mode 1 AM mono 1 AM stereo 0 AM through Stereo decoder 0 FM- Stereo decoder In-gain 14dB 12dB : ...
Page 37
... TDA7460ND Table 14. Loudness MSB Note: The attenuation is specified at high frequencies. Around the center frequency the value is different depending on the programmed attenuation (see Loudness frequency Data byte specification LSB Function D0 Attenuation - -15 dB Filter on off (flat) Center frequency 200 Hz 400 Hz Loudness Q st low (1 ...
Page 38
... TDA7460ND Function Mute Enable soft mute Disable soft mute Mute time =0.48 ms Mute time =0.96 ms Mute time =40.4 ms Mute time =324 ms Stereo decoder soft mute Influence = off stereo decoder soft mute influence = on Beep Beep frequency = 600 Hz Beep frequency = 1.2 kHz Mixing ...
Page 39
... TDA7460ND Table 16. Volume MSB Note not recommended to use a gain more than 20dB for system performance reason. In general, the max. gain should be limited by software to the maximum value, which is needed for the system Data byte specification LSB Function D0 Gain/attenuation -79 dB Soft step Soft step volume = off ...
Page 40
... Data byte specification Table 17. Bass and treble attenuation MSB For example 12 dB Treble and -8 dB Bass give the following DATA BYTE 40/ TDA7460ND LSB Function D0 Treble steps +14 dB Bass steps - +12 dB +14 dB ...
Page 41
... TDA7460ND Table 18. Bass and treble filter characteristics MSB For example Treble center frequency = 15 kHz, Bass center frequency = 100 Hz, Bass and give the following DATA BYTE Data byte specification LSB Function D0 Treble 0 Center frequency = 10 KHz 1 Center frequency = 12.5 KHz 0 Center frequency = 15 KHz 1 Center frequency = 17 ...
Page 42
... For example 12dB Treble and -8dB Bass give the following DATA BYTE 42/49 LSB TDA7460ND Function Attenuation -23 dB -24.5 dB -26 dB -28 dB -30 dB -32 dB -35 dB -40 dB -50 dB Speaker mute Must be "1" (except RR speaker; see below) Blank Time adj. (only at RR speaker) 38μs 25.5μs 32μs 22μs Bass Steps - +12 dB +14 dB ...
Page 43
... TDA7460ND Table 20. Stereo decoder MSB Table 21. Noise blanker MSB Data byte specification LSB Function D0 0 STD unmuted STD muted 1 IN-Gain 11 dB IN-Gain 8.5 dB IN-Gain 6 dB IN-Gain 3.5 dB must be "1” Forced mono Mono/stereo switch automatically Pilot threshold high Pilot threshold low De-emphasis 50 μ ...
Page 44
... High cut on LSB Function D0 Noise rectifier discharge resistor infinite kΩ kΩ =18 kΩ Multipath detector bandpass gain Multipath detector internal influence on off Multipath/function selected (MPIN, MPOUT) Additional input selected (phone) Multipath detector reflection gain Gain = 7.6 dB Gain = 4.6 dB Gain = 0 dB Off TDA7460ND ...
Page 45
... TDA7460ND Table 24. Stereo decoder adjustment MSB Data byte specification LSB Function D0 Roll-off compensation 0 not allowed 1 20.2% 0 21. 25. 31.0% Level gain 0dB 0.66dB 1.33dB : 10dB Temperature compensation at LEVEL input 16.7mV/K (3300ppm) 45/49 ...
Page 46
... TDA7460ND LSB Function D0 Stereo decoder test signals 0 Off 1 Test signals enabled if bit D5 of the subaddress (test mode bit) is set to "1", too External clock Internal clock Test signals at CASS_R VHCCH Level intern Pilot magnitude VCOCON; VCO Control Voltage Pilot threshold HOLDN NB threshold ...
Page 47
... TDA7460ND 8 Package information In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ® ECOPACK trademark. Figure 31. SO20 mechanical data and package dimensions DIM. ...
Page 48
... Revision history 9 Revision history Table 26. Document revision history Date 24-Jun-2000 06-Mar-2009 48/49 Revision 3 Initial release. Document reformatted. Document status changed from datasheet to not for new design. 4 Added Table 1: Device summary on page Updated Section 8: Package information on page TDA7460ND Changes 1. 47. ...
Page 49
... TDA7460ND Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...